You might have more success if you dial it back, average users don't need that deep of an understanding. They just need a functional system that does what they expect it to.

I've converted several family members to Linux to ease my own role as their tech support. And it was as simple as preloading things they'd need, showing them what the new browser/email/whatever looked like, showing them the new "app store" (KDE Discover), and telling them to call me if it breaks. Some of them explored further and learned how the system works, others were just happy to click the buttons I showed them. None of them regret the change.